Kubernetes Service 之 LoadBalancer
Kubernetes 之 LoadBalancer
定义
负载均衡器 (LoadBalancer) 是 Kubernetes 中用来对外暴露 Service 服务的，它可以将服务集中到一个公共 IP 上。我们常用 MetalLB 作为自建均衡器。
使用
安装 MetalLB
kubectl apply -f https://raw.githubusercontent.com/metallb/metallb/v0.14.7/config/manifests/metallb-native.yaml
配置 ARP IP 池
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: first-pool
namespace: metallb-system
spec:
addresses:
- 192.168.31.70-192.168.31.90
kubectl apply -f metalb-ips.yml
导入新镜像statis-web-1.0.90.tar
ctr -n=k8s.io images import static-web-1.0.90.tar
// go 语言编写的 web static 镜像代码
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
htmlContent := os.Getenv("HTML_BODY_CONTENT")
if htmlContent == "" {
htmlContent = "<html><body><h1>No Content Set</h1></body></html>"
} else {
htmlContent = "<html><body><h1>" + htmlContent + "</h1></body></html>"
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, _ = fmt.Fprint(w, htmlContent)
})
port := ":80"
fmt.Printf("Server is listening on port %s\n", port)
err := http.ListenAndServe(port, nil)
if err != nil {
fmt.Printf("Error starting server: %v\n", err)
}
}
创建测试 Deployment 和 Service
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment-web-static
namespace: default
labels:
app: deployment-web-static
spec:
replicas: 2
selector:
matchLabels:
app: pod-web-static
template:
metadata:
labels:
app: pod-web-static
spec:
containers:
- name: web-static
image: static-web:1.0.90
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
env:
- name: HTML_BODY_CONTENT
value: "This is a test"
---
apiVersion: v1
kind: Service
metadata:
name: service-static-web
namespace: default
labels:
app: service-static-web
spec:
type: LoadBalancer
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: pod-web-static
测试
root@k8s-master1:~# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 67d
service-static-web LoadBalancer 10.102.54.255 192.168.31.70 80:30487/TCP 3m13s
root@k8s-master1:~# curl 192.168.31.70
<html><body><h1>This is a test</h1></body></html>
原文地址：https://blog.csdn.net/baidu_34688878/article/details/140559748
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